[Bug 1923464] [NEW] ideally should boot rootfs from a matching hard drive

[Dimitri John Ledkov]

Public bug reported:

Ideally we should strive to boot rootfs from a matching hard drive.

I.e. if we are booting rootfs by UUID, we should try to find the one
that came from the same drive as where ESP (UEFI) came from, or u-boot
spl / u-boot got loaded from (loader1/loader2).

Such that for example, when booted from external usb stick, rootfs from
there is mounted.

Or when booted from internal drive whilst a dd backup is attached over
usb, rootfs is loaded from the internal drive not from the usb attached
backup.

This would need:

* u-boot to export the drive it loaded extlinux.conf / bootscript from,
and pass it on kernel command line

* grub to export the device UUID it got loaded from (from the
BootServices EFI table) and pass it on the kernel command line or via
runtime EFI variable

* sdboot already does that I believe, but not sure if initramfs-tools
consumes the sdboot provided information

* initramfs-tools to consume above and sort the discovered devices based
on that, when deciding what to mount as rootfs

** Affects: cloud-images
     Importance: Undecided
         Status: New

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: u-boot (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: u-boot-menu (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: rls-ii-incoming

** Description changed:

  Ideally we should strive to boot rootfs from a matching hard drive.
  
  I.e. if we are booting rootfs by UUID, we should try to find the one
  that came from the same drive as where ESP (UEFI) came from, or u-boot
  spl / u-boot got loaded from (loader1/loader2).
  
  Such that for example, when booted from external usb stick, rootfs from
  there is mounted.
  
  Or when booted from internal drive whilst a dd backup is attached over
  usb, rootfs is loaded from the internal drive not from the usb attached
  backup.
  
  This would need:
  
  * u-boot to export the drive it loaded extlinux.conf / bootscript from,
  and pass it on kernel command line
  
  * grub to export the device UUID it got loaded from (from the
  BootServices EFI table) and pass it on the kernel command line or via
  runtime EFI variable
  
+ * sdboot already does that I believe, but not sure if initramfs-tools
+ consumes the sdboot provided information
+ 
  * initramfs-tools to consume above and sort the discovered devices based
  on that, when deciding what to mount as rootfs

** Also affects: grub2 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: systemd (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: u-boot (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: u-boot-menu (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: cloud-images
   Importance: Undecided
       Status: New

** Tags added: rls-ii-incoming

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to initramfs-tools in Ubuntu.
https://bugs.launchpad.net/bugs/1923464

Title:
  ideally should boot rootfs from a matching hard drive

Status in cloud-images:
  New
Status in grub2 package in Ubuntu:
  New
Status in initramfs-tools package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New
Status in u-boot package in Ubuntu:
  New
Status in u-boot-menu package in Ubuntu:
  New

Bug description:
  Ideally we should strive to boot rootfs from a matching hard drive.

  I.e. if we are booting rootfs by UUID, we should try to find the one
  that came from the same drive as where ESP (UEFI) came from, or u-boot
  spl / u-boot got loaded from (loader1/loader2).

  Such that for example, when booted from external usb stick, rootfs
  from there is mounted.

  Or when booted from internal drive whilst a dd backup is attached over
  usb, rootfs is loaded from the internal drive not from the usb
  attached backup.

  This would need:

  * u-boot to export the drive it loaded extlinux.conf / bootscript
  from, and pass it on kernel command line

  * grub to export the device UUID it got loaded from (from the
  BootServices EFI table) and pass it on the kernel command line or via
  runtime EFI variable

  * sdboot already does that I believe, but not sure if initramfs-tools
  consumes the sdboot provided information

  * initramfs-tools to consume above and sort the discovered devices
  based on that, when deciding what to mount as rootfs

To manage notifications about this bug go to:
https://bugs.launchpad.net/cloud-images/+bug/1923464/+subscriptions